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Glossary of Technical Terms 61
Sound Reproducing — Process of re-creating the recorded sound from film or disc.
Sound Studio — A motion picture studio designed witli special wall, floor and ceiling covering to limit reverberations, exclude foreign noises, and give the proper effect to any sounds produced in the studio for recording.
Sound Track — The portion of the film on which the sound is recorded.
Spectrogram — A photographic representation showing the distribution of energy in the spectrum. These are most commonly used to show graphically the spectral distribution of energy and the radiation from a light source, the spectral distribution of energy transmitted by or reflected from selectively absorbing materials, and the spectral distribution of the sensitivity of photographic materials.
Spectrophotometry — The science of measuring the distribution of energy at various wave-lengths.
Specular density — The value of density in which the specular component of transmitted intensity is measured. (This value of density is applicable to projection printing and projection in general.)
Speed — The inverse of inertia multiplied by a constant factor.
Splicing — Joining the ends of film by cementing.
Split Eeel — A reel of film of two (or more) parts, the subject of each part unrelated to the subject of the other part.
Spot — The illuminated area on the cooling plate of a motion picture projector.
Sprocket — The toothed cylinder which engages the perforations in the film.
Stationary Period — That portion of the picture cycle during which the film at the aperture is stationary. This period is expressed in degrees of revolution of the fly wheel when 360 degrees are equal to one cycle.
Steradian — The solid angle described by the rotation of a radian about its bisector or an axis.
Stereopticon-Stereopticon or Optical Lantern — An apparatus for optically projecting transparent still pictures.
Still — A picture without movement ; e.g., a picture from a single negative.